Investigators said a 38-year-old man was shot and killed at a home near Orange City on Tuesday.
The shooter, identified as 68-year-old William Shope, shot and killed his son Adam Shope in a bedroom, authorities said.
"I just shot my son," he said on the 911 call.
"I've got to go see if he's still alive," he said. "I can't breathe. He attacked me."
Deputies said the shooting may have been justified, but no decision has been made as to if charges will be filed until all the evidence can be reviewed.
It happened at a home on Volusia Avenue at the Floriland Mobile Home Park at about 7 p.m.
William Shope told authorities that Adam Shope took his father's handgun and threatened to commit suicide.